I was taught how to fly an arc by a pilot whose professional career started in the 1930s. His method was the thrupenny bit , breaking the arc into ten degrees segments and changing the heading accordingly. His DC-2/3 wasn't much faster than your Cessna.
The Airbus I fly now can determine its position to a few metres and it varies the bank to stay on the arc. It is easier to leave the autopilot engaged whilst it does this